<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: luofei614 <weibo.com/luofei614>
// +----------------------------------------------------------------------
// $Id$

/**
 * 将Trace信息输出到火狐的firebug，从而不影响ajax效果和页面的布局。
 * 使用前，你需要先在火狐浏览器上安装firebug和firePHP两个插件。
 * 定义应用的tags.php文件，
 * <code>
 * <?php return array(
 * 'app_end'=>array(
 * 'FireShowPageTrace'
 * )
 * );
 * </code>
 * 再将此文件放到应用的Behavior文件夹中即可
 * 如果trace信息没有正常输出，请查看您的日志。
 * firePHP，是通过http headers和firebug通讯的，所以要保证在输出trace信息之前不能有
 * headers输出，你可以在入口文件第一行加入代码 ob_start(); 或者配置output_buffering
 */
namespace Behavior;

/**
 * 系统行为扩展 页面Trace显示输出
 */
class FireShowPageTraceBehavior
{

    protected $tracePagTabs = array(
        'BASE' => '基本',
        'FILE' => '文件',
        'INFO' => '流程',
        'ERR|NOTIC' => '错误',
        'SQL' => 'SQL',
        'DEBUG' => '调试'
    );
    
    // 行为扩展的执行入口必须是run
    public function run(&$params)
    {
        if (C('FIRE_SHOW_PAGE_TRACE', null, true))
            $this->showTrace();
    }

    /**
     * 显示页面Trace信息
     * 
     * @access private
     */
    private function showTrace()
    {
        // 系统默认显示信息
        $files = get_included_files();
        $info = array();
        foreach ($files as $key => $file) {
            $info[] = $file . ' ( ' . number_format(filesize($file) / 1024, 2) . ' KB )';
        }
        $trace = array();
        $base = array(
            '请求信息' => date('Y-m-d H:i:s', $_SERVER['REQUEST_TIME']) . ' ' . $_SERVER['SERVER_PROTOCOL'] . ' ' . $_SERVER['REQUEST_METHOD'] . ' : ' . __SELF__,
            '运行时间' => $this->showTime(),
            '内存开销' => MEMORY_LIMIT_ON ? number_format((memory_get_usage() - $GLOBALS['_startUseMems']) / 1024, 2) . ' kb' : '不支持',
            '查询信息' => N('db_query') . ' queries ' . N('db_write') . ' writes ',
            '文件加载' => count(get_included_files()),
            '缓存信息' => N('cache_read') . ' gets ' . N('cache_write') . ' writes ',
            '配置加载' => count(c()),
            '会话信息' => 'SESSION_ID=' . session_id()
        );
        // 读取应用定义的Trace文件
        $traceFile = CONF_PATH . 'trace.php';
        if (is_file($traceFile)) {
            $base = array_merge($base, include $traceFile);
        }
        $debug = trace();
        $tabs = C('TRACE_PAGE_TABS', null, $this->tracePagTabs);
        foreach ($tabs as $name => $title) {
            switch (strtoupper($name)) {
                case 'BASE': // 基本信息
                    $trace[$title] = $base;
                    break;
                case 'FILE': // 文件信息
                    $trace[$title] = $info;
                    break;
                default: // 调试信息
                    if (strpos($name, '|')) { // 多组信息
                        $array = explode('|', $name);
                        $result = array();
                        foreach ($array as $name) {
                            $result += isset($debug[$name]) ? $debug[$name] : array();
                        }
                        $trace[$title] = $result;
                    } else {
                        $trace[$title] = isset($debug[$name]) ? $debug[$name] : '';
                    }
            }
        }
        foreach ($trace as $key => $val) {
            if (! is_array($val) && empty($val))
                $val = array();
            if (is_array($val)) {
                $fire = array(
                    array(
                        '',
                        ''
                    )
                );
                foreach ($val as $k => $v) {
                    $fire[] = array(
                        $k,
                        $v
                    );
                }
                fb(array(
                    $key,
                    $fire
                ), FirePHP::TABLE);
            } else {
                fb($val, $key);
            }
        }
        unset($files, $info, $log, $base);
    }

    /**
     * 获取运行时间
     */
    private function showTime()
    {
        // 显示运行时间
        G('beginTime', $GLOBALS['_beginTime']);
        G('viewEndTime');
        // 显示详细运行时间
        return G('beginTime', 'viewEndTime') . 's ( Load:' . G('beginTime', 'loadTime') . 's Init:' . G('loadTime', 'initTime') . 's Exec:' . G('initTime', 'viewStartTime') . 's Template:' . G('viewStartTime', 'viewEndTime') . 's )';
    }
}

function fb()
{
    $instance = FirePHP::getInstance(true);
    
    $args = func_get_args();
    return call_user_func_array(array(
        $instance,
        'fb'
    ), $args);
}

class FB
{

    /**
     * Enable and disable logging to Firebug
     *
     * @see FirePHP->setEnabled()
     * @param boolean $Enabled
     *            TRUE to enable, FALSE to disable
     * @return void
     */
    public static function setEnabled($Enabled)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setEnabled($Enabled);
    }

    /**
     * Check if logging is enabled
     *
     * @see FirePHP->getEnabled()
     * @return boolean TRUE if enabled
     */
    public static function getEnabled()
    {
        $instance = FirePHP::getInstance(true);
        return $instance->getEnabled();
    }

    /**
     * Specify a filter to be used when encoding an object
     *
     * Filters are used to exclude object members.
     *
     * @see FirePHP->setObjectFilter()
     * @param string $Class
     *            The class name of the object
     * @param array $Filter
     *            An array or members to exclude
     * @return void
     */
    public static function setObjectFilter($Class, $Filter)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setObjectFilter($Class, $Filter);
    }

    /**
     * Set some options for the library
     *
     * @see FirePHP->setOptions()
     * @param array $Options
     *            The options to be set
     * @return void
     */
    public static function setOptions($Options)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setOptions($Options);
    }

    /**
     * Get options for the library
     *
     * @see FirePHP->getOptions()
     * @return array The options
     */
    public static function getOptions()
    {
        $instance = FirePHP::getInstance(true);
        return $instance->getOptions();
    }

    /**
     * Log object to firebug
     *
     * @see http://www.firephp.org/Wiki/Reference/Fb
     * @param mixed $Object            
     * @return true
     * @throws Exception
     */
    public static function send()
    {
        $instance = FirePHP::getInstance(true);
        $args = func_get_args();
        return call_user_func_array(array(
            $instance,
            'fb'
        ), $args);
    }

    /**
     * Start a group for following messages
     *
     * Options:
     * Collapsed: [true|false]
     * Color: [#RRGGBB|ColorName]
     *
     * @param string $Name            
     * @param array $Options
     *            OPTIONAL Instructions on how to log the group
     * @return true
     */
    public static function group($Name, $Options = null)
    {
        $instance = FirePHP::getInstance(true);
        return $instance->group($Name, $Options);
    }

    /**
     * Ends a group you have started before
     *
     * @return true
     * @throws Exception
     */
    public static function groupEnd()
    {
        return self::send(null, null, FirePHP::GROUP_END);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::LOG
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public static function log($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::LOG);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::INFO
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public static function info($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::INFO);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::WARN
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public static function warn($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::WARN);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::ERROR
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public static function error($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::ERROR);
    }

    /**
     * Dumps key and variable to firebug server panel
     *
     * @see FirePHP::DUMP
     * @param string $Key            
     * @param mixed $Variable            
     * @return true
     * @throws Exception
     */
    public static function dump($Key, $Variable)
    {
        return self::send($Variable, $Key, FirePHP::DUMP);
    }

    /**
     * Log a trace in the firebug console
     *
     * @see FirePHP::TRACE
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public static function trace($Label)
    {
        return self::send($Label, FirePHP::TRACE);
    }

    /**
     * Log a table in the firebug console
     *
     * @see FirePHP::TABLE
     * @param string $Label            
     * @param string $Table            
     * @return true
     * @throws Exception
     */
    public static function table($Label, $Table)
    {
        return self::send($Table, $Label, FirePHP::TABLE);
    }
}

if (! defined('E_STRICT')) {
    define('E_STRICT', 2048);
}
if (! defined('E_RECOVERABLE_ERROR')) {
    define('E_RECOVERABLE_ERROR', 4096);
}
if (! defined('E_DEPRECATED')) {
    define('E_DEPRECATED', 8192);
}
if (! defined('E_USER_DEPRECATED')) {
    define('E_USER_DEPRECATED', 16384);
}

/**
 * Sends the given data to the FirePHP Firefox Extension.
 * The data can be displayed in the Firebug Console or in the
 * "Server" request tab.
 *
 * For more information see: http://www.firephp.org/
 *
 * @copyright Copyright (C) 2007-2009 Christoph Dorn
 * @author Christoph Dorn <christoph@christophdorn.com>
 * @license http://www.opensource.org/licenses/bsd-license.php
 * @package FirePHPCore
 */
class FirePHP
{

    /**
     * FirePHP version
     *
     * @var string
     */
    const VERSION = '0.3';
 // @pinf replace '0.3' with '%%package.version%%'
    
    /**
     * Firebug LOG level
     *
     * Logs a message to firebug console.
     *
     * @var string
     */
    const LOG = 'LOG';

    /**
     * Firebug INFO level
     *
     * Logs a message to firebug console and displays an info icon before the message.
     *
     * @var string
     */
    const INFO = 'INFO';

    /**
     * Firebug WARN level
     *
     * Logs a message to firebug console, displays an warning icon before the message and colors the line turquoise.
     *
     * @var string
     */
    const WARN = 'WARN';

    /**
     * Firebug ERROR level
     *
     * Logs a message to firebug console, displays an error icon before the message and colors the line yellow. Also increments the firebug error count.
     *
     * @var string
     */
    const ERROR = 'ERROR';

    /**
     * Dumps a variable to firebug's server panel
     *
     * @var string
     */
    const DUMP = 'DUMP';

    /**
     * Displays a stack trace in firebug console
     *
     * @var string
     */
    const TRACE = 'TRACE';

    /**
     * Displays an exception in firebug console
     *
     * Increments the firebug error count.
     *
     * @var string
     */
    const EXCEPTION = 'EXCEPTION';

    /**
     * Displays an table in firebug console
     *
     * @var string
     */
    const TABLE = 'TABLE';

    /**
     * Starts a group in firebug console
     *
     * @var string
     */
    const GROUP_START = 'GROUP_START';

    /**
     * Ends a group in firebug console
     *
     * @var string
     */
    const GROUP_END = 'GROUP_END';

    /**
     * Singleton instance of FirePHP
     *
     * @var FirePHP
     */
    protected static $instance = null;

    /**
     * Flag whether we are logging from within the exception handler
     *
     * @var boolean
     */
    protected $inExceptionHandler = false;

    /**
     * Flag whether to throw PHP errors that have been converted to ErrorExceptions
     *
     * @var boolean
     */
    protected $throwErrorExceptions = true;

    /**
     * Flag whether to convert PHP assertion errors to Exceptions
     *
     * @var boolean
     */
    protected $convertAssertionErrorsToExceptions = true;

    /**
     * Flag whether to throw PHP assertion errors that have been converted to Exceptions
     *
     * @var boolean
     */
    protected $throwAssertionExceptions = false;

    /**
     * Wildfire protocol message index
     *
     * @var int
     */
    protected $messageIndex = 1;

    /**
     * Options for the library
     *
     * @var array
     */
    protected $options = array(
        'maxDepth' => 10,
        'maxObjectDepth' => 5,
        'maxArrayDepth' => 5,
        'useNativeJsonEncode' => true,
        'includeLineNumbers' => true
    );

    /**
     * Filters used to exclude object members when encoding
     *
     * @var array
     */
    protected $objectFilters = array(
        'firephp' => array(
            'objectStack',
            'instance',
            'json_objectStack'
        ),
        'firephp_test_class' => array(
            'objectStack',
            'instance',
            'json_objectStack'
        )
    );

    /**
     * A stack of objects used to detect recursion during object encoding
     *
     * @var object
     */
    protected $objectStack = array();

    /**
     * Flag to enable/disable logging
     *
     * @var boolean
     */
    protected $enabled = true;

    /**
     * The insight console to log to if applicable
     *
     * @var object
     */
    protected $logToInsightConsole = null;

    /**
     * When the object gets serialized only include specific object members.
     *
     * @return array
     */
    public function __sleep()
    {
        return array(
            'options',
            'objectFilters',
            'enabled'
        );
    }

    /**
     * Gets singleton instance of FirePHP
     *
     * @param boolean $AutoCreate            
     * @return FirePHP
     */
    public static function getInstance($AutoCreate = false)
    {
        if ($AutoCreate === true && ! self::$instance) {
            self::init();
        }
        return self::$instance;
    }

    /**
     * Creates FirePHP object and stores it for singleton access
     *
     * @return FirePHP
     */
    public static function init()
    {
        return self::setInstance(new self());
    }

    /**
     * Set the instance of the FirePHP singleton
     *
     * @param FirePHP $instance
     *            The FirePHP object instance
     * @return FirePHP
     */
    public static function setInstance($instance)
    {
        return self::$instance = $instance;
    }

    /**
     * Set an Insight console to direct all logging calls to
     *
     * @param object $console
     *            The console object to log to
     * @return void
     */
    public function setLogToInsightConsole($console)
    {
        if (is_string($console)) {
            if (get_class($this) != 'FirePHP_Insight' && ! is_subclass_of($this, 'FirePHP_Insight')) {
                throw new Exception('FirePHP instance not an instance or subclass of FirePHP_Insight!');
            }
            $this->logToInsightConsole = $this->to('request')->console($console);
        } else {
            $this->logToInsightConsole = $console;
        }
    }

    /**
     * Enable and disable logging to Firebug
     *
     * @param boolean $Enabled
     *            TRUE to enable, FALSE to disable
     * @return void
     */
    public function setEnabled($Enabled)
    {
        $this->enabled = $Enabled;
    }

    /**
     * Check if logging is enabled
     *
     * @return boolean TRUE if enabled
     */
    public function getEnabled()
    {
        return $this->enabled;
    }

    /**
     * Specify a filter to be used when encoding an object
     *
     * Filters are used to exclude object members.
     *
     * @param string $Class
     *            The class name of the object
     * @param array $Filter
     *            An array of members to exclude
     * @return void
     */
    public function setObjectFilter($Class, $Filter)
    {
        $this->objectFilters[strtolower($Class)] = $Filter;
    }

    /**
     * Set some options for the library
     *
     * Options:
     * - maxDepth: The maximum depth to traverse (default: 10)
     * - maxObjectDepth: The maximum depth to traverse objects (default: 5)
     * - maxArrayDepth: The maximum depth to traverse arrays (default: 5)
     * - useNativeJsonEncode: If true will use json_encode() (default: true)
     * - includeLineNumbers: If true will include line numbers and filenames (default: true)
     *
     * @param array $Options
     *            The options to be set
     * @return void
     */
    public function setOptions($Options)
    {
        $this->options = array_merge($this->options, $Options);
    }

    /**
     * Get options from the library
     *
     * @return array The currently set options
     */
    public function getOptions()
    {
        return $this->options;
    }

    /**
     * Set an option for the library
     *
     * @param string $Name            
     * @param mixed $Value            
     * @throws Exception
     * @return void
     */
    public function setOption($Name, $Value)
    {
        if (! isset($this->options[$Name])) {
            throw $this->newException('Unknown option: ' . $Name);
        }
        $this->options[$Name] = $Value;
    }

    /**
     * Get an option from the library
     *
     * @param string $Name            
     * @throws Exception
     * @return mixed
     */
    public function getOption($Name)
    {
        if (! isset($this->options[$Name])) {
            throw $this->newException('Unknown option: ' . $Name);
        }
        return $this->options[$Name];
    }

    /**
     * Register FirePHP as your error handler
     *
     * Will throw exceptions for each php error.
     *
     * @return mixed Returns a string containing the previously defined error handler (if any)
     */
    public function registerErrorHandler($throwErrorExceptions = false)
    {
        // NOTE: The following errors will not be caught by this error handler:
        // E_ERROR, E_PARSE, E_CORE_ERROR,
        // E_CORE_WARNING, E_COMPILE_ERROR,
        // E_COMPILE_WARNING, E_STRICT
        $this->throwErrorExceptions = $throwErrorExceptions;
        
        return set_error_handler(array(
            $this,
            'errorHandler'
        ));
    }

    /**
     * FirePHP's error handler
     *
     * Throws exception for each php error that will occur.
     *
     * @param int $errno            
     * @param string $errstr            
     * @param string $errfile            
     * @param int $errline            
     * @param array $errcontext            
     */
    public function errorHandler($errno, $errstr, $errfile, $errline, $errcontext)
    {
        // Don't throw exception if error reporting is switched off
        if (error_reporting() == 0) {
            return;
        }
        // Only throw exceptions for errors we are asking for
        if (error_reporting() & $errno) {
            
            $exception = new ErrorException($errstr, 0, $errno, $errfile, $errline);
            if ($this->throwErrorExceptions) {
                throw $exception;
            } else {
                $this->fb($exception);
            }
        }
    }

    /**
     * Register FirePHP as your exception handler
     *
     * @return mixed Returns the name of the previously defined exception handler,
     *         or NULL on error.
     *         If no previous handler was defined, NULL is also returned.
     */
    public function registerExceptionHandler()
    {
        return set_exception_handler(array(
            $this,
            'exceptionHandler'
        ));
    }

    /**
     * FirePHP's exception handler
     *
     * Logs all exceptions to your firebug console and then stops the script.
     *
     * @param Exception $Exception            
     * @throws Exception
     */
    function exceptionHandler($Exception)
    {
        $this->inExceptionHandler = true;
        
        header('HTTP/1.1 500 Internal Server Error');
        
        try {
            $this->fb($Exception);
        } catch (Exception $e) {
            echo 'We had an exception: ' . $e;
        }
        $this->inExceptionHandler = false;
    }

    /**
     * Register FirePHP driver as your assert callback
     *
     * @param boolean $convertAssertionErrorsToExceptions            
     * @param boolean $throwAssertionExceptions            
     * @return mixed Returns the original setting or FALSE on errors
     */
    public function registerAssertionHandler($convertAssertionErrorsToExceptions = true, $throwAssertionExceptions = false)
    {
        $this->convertAssertionErrorsToExceptions = $convertAssertionErrorsToExceptions;
        $this->throwAssertionExceptions = $throwAssertionExceptions;
        
        if ($throwAssertionExceptions && ! $convertAssertionErrorsToExceptions) {
            throw $this->newException('Cannot throw assertion exceptions as assertion errors are not being converted to exceptions!');
        }
        
        return assert_options(ASSERT_CALLBACK, array(
            $this,
            'assertionHandler'
        ));
    }

    /**
     * FirePHP's assertion handler
     *
     * Logs all assertions to your firebug console and then stops the script.
     *
     * @param string $file
     *            File source of assertion
     * @param int $line
     *            Line source of assertion
     * @param mixed $code
     *            Assertion code
     */
    public function assertionHandler($file, $line, $code)
    {
        if ($this->convertAssertionErrorsToExceptions) {
            
            $exception = new ErrorException('Assertion Failed - Code[ ' . $code . ' ]', 0, null, $file, $line);
            
            if ($this->throwAssertionExceptions) {
                throw $exception;
            } else {
                $this->fb($exception);
            }
        } else {
            $this->fb($code, 'Assertion Failed', FirePHP::ERROR, array(
                'File' => $file,
                'Line' => $line
            ));
        }
    }

    /**
     * Start a group for following messages.
     *
     * Options:
     * Collapsed: [true|false]
     * Color: [#RRGGBB|ColorName]
     *
     * @param string $Name            
     * @param array $Options
     *            OPTIONAL Instructions on how to log the group
     * @return true
     * @throws Exception
     */
    public function group($Name, $Options = null)
    {
        if (! $Name) {
            throw $this->newException('You must specify a label for the group!');
        }
        
        if ($Options) {
            if (! is_array($Options)) {
                throw $this->newException('Options must be defined as an array!');
            }
            if (array_key_exists('Collapsed', $Options)) {
                $Options['Collapsed'] = ($Options['Collapsed']) ? 'true' : 'false';
            }
        }
        
        return $this->fb(null, $Name, FirePHP::GROUP_START, $Options);
    }

    /**
     * Ends a group you have started before
     *
     * @return true
     * @throws Exception
     */
    public function groupEnd()
    {
        return $this->fb(null, null, FirePHP::GROUP_END);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::LOG
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public function log($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::LOG, $Options);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::INFO
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public function info($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::INFO, $Options);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::WARN
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public function warn($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::WARN, $Options);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::ERROR
     * @param mixes $Object            
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public function error($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::ERROR, $Options);
    }

    /**
     * Dumps key and variable to firebug server panel
     *
     * @see FirePHP::DUMP
     * @param string $Key            
     * @param mixed $Variable            
     * @return true
     * @throws Exception
     */
    public function dump($Key, $Variable, $Options = array())
    {
        if (! is_string($Key)) {
            throw $this->newException('Key passed to dump() is not a string');
        }
        if (strlen($Key) > 100) {
            throw $this->newException('Key passed to dump() is longer than 100 characters');
        }
        if (! preg_match_all('/^[a-zA-Z0-9-_\.:]*$/', $Key, $m)) {
            throw $this->newException('Key passed to dump() contains invalid characters [a-zA-Z0-9-_\.:]');
        }
        return $this->fb($Variable, $Key, FirePHP::DUMP, $Options);
    }

    /**
     * Log a trace in the firebug console
     *
     * @see FirePHP::TRACE
     * @param string $Label            
     * @return true
     * @throws Exception
     */
    public function trace($Label)
    {
        return $this->fb($Label, FirePHP::TRACE);
    }

    /**
     * Log a table in the firebug console
     *
     * @see FirePHP::TABLE
     * @param string $Label            
     * @param string $Table            
     * @return true
     * @throws Exception
     */
    public function table($Label, $Table, $Options = array())
    {
        return $this->fb($Table, $Label, FirePHP::TABLE, $Options);
    }

    /**
     * Insight API wrapper
     *
     * @see Insight_Helper::to()
     */
    public static function to()
    {
        $instance = self::getInstance();
        if (! method_exists($instance, "_to")) {
            throw new Exception("FirePHP::to() implementation not loaded");
        }
        $args = func_get_args();
        return call_user_func_array(array(
            $instance,
            '_to'
        ), $args);
    }

    /**
     * Insight API wrapper
     *
     * @see Insight_Helper::plugin()
     */
    public static function plugin()
    {
        $instance = self::getInstance();
        if (! method_exists($instance, "_plugin")) {
            throw new Exception("FirePHP::plugin() implementation not loaded");
        }
        $args = func_get_args();
        return call_user_func_array(array(
            $instance,
            '_plugin'
        ), $args);
    }

    /**
     * Check if FirePHP is installed on client
     *
     * @return boolean
     */
    public function detectClientExtension()
    {
        // Check if FirePHP is installed on client via User-Agent header
        if (@preg_match_all('/\sFirePHP\/([\.\d]*)\s?/si', $this->getUserAgent(), $m) && version_compare($m[1][0], '0.0.6', '>=')) {
            return true;
        } else 
            // Check if FirePHP is installed on client via X-FirePHP-Version header
            if (@preg_match_all('/^([\.\d]*)$/si', $this->getRequestHeader("X-FirePHP-Version"), $m) && version_compare($m[1][0], '0.0.6', '>=')) {
                return true;
            }
        return false;
    }

    /**
     * Log varible to Firebug
     *
     * @see http://www.firephp.org/Wiki/Reference/Fb
     * @param mixed $Object
     *            The variable to be logged
     * @return true Return TRUE if message was added to headers, FALSE otherwise
     * @throws Exception
     */
    public function fb($Object)
    {
        if ($this instanceof FirePHP_Insight && method_exists($this, '_logUpgradeClientMessage')) {
            if (! FirePHP_Insight::$upgradeClientMessageLogged) { // avoid infinite recursion as _logUpgradeClientMessage() logs a message
                $this->_logUpgradeClientMessage();
            }
        }
        
        static $insightGroupStack = array();
        
        if (! $this->getEnabled()) {
            return false;
        }
        
        if ($this->headersSent($filename, $linenum)) {
            // If we are logging from within the exception handler we cannot throw another exception
            if ($this->inExceptionHandler) {
                // Simply echo the error out to the page
                echo '<div style="border: 2px solid red; font-family: Arial; font-size: 12px; background-color: lightgray; padding: 5px;"><span style="color: red; font-weight: bold;">FirePHP ERROR:</span> Headers already sent in <b>' . $filename . '</b> on line <b>' . $linenum . '</b>. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.</div>';
            } else {
                throw $this->newException('Headers already sent in ' . $filename . ' on line ' . $linenum . '. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.');
            }
        }
        
        $Type = null;
        $Label = null;
        $Options = array();
        
        if (func_num_args() == 1) {} else 
            if (func_num_args() == 2) {
                switch (func_get_arg(1)) {
                    case self::LOG:
                    case self::INFO:
                    case self::WARN:
                    case self::ERROR:
                    case self::DUMP:
                    case self::TRACE:
                    case self::EXCEPTION:
                    case self::TABLE:
                    case self::GROUP_START:
                    case self::GROUP_END:
                        $Type = func_get_arg(1);
                        break;
                    default:
                        $Label = func_get_arg(1);
                        break;
                }
            } else 
                if (func_num_args() == 3) {
                    $Type = func_get_arg(2);
                    $Label = func_get_arg(1);
                } else 
                    if (func_num_args() == 4) {
                        $Type = func_get_arg(2);
                        $Label = func_get_arg(1);
                        $Options = func_get_arg(3);
                    } else {
                        throw $this->newException('Wrong number of arguments to fb() function!');
                    }
        
        if ($this->logToInsightConsole !== null && (get_class($this) == 'FirePHP_Insight' || is_subclass_of($this, 'FirePHP_Insight'))) {
            $msg = $this->logToInsightConsole;
            if ($Object instanceof Exception) {
                $Type = self::EXCEPTION;
            }
            if ($Label && $Type != self::TABLE && $Type != self::GROUP_START) {
                $msg = $msg->label($Label);
            }
            switch ($Type) {
                case self::DUMP:
                case self::LOG:
                    return $msg->log($Object);
                case self::INFO:
                    return $msg->info($Object);
                case self::WARN:
                    return $msg->warn($Object);
                case self::ERROR:
                    return $msg->error($Object);
                case self::TRACE:
                    return $msg->trace($Object);
                case self::EXCEPTION:
                    return $this->plugin('engine')->handleException($Object, $msg);
                case self::TABLE:
                    if (isset($Object[0]) && ! is_string($Object[0]) && $Label) {
                        $Object = array(
                            $Label,
                            $Object
                        );
                    }
                    return $msg->table($Object[0], array_slice($Object[1], 1), $Object[1][0]);
                case self::GROUP_START:
                    $insightGroupStack[] = $msg->group(md5($Label))->open();
                    return $msg->log($Label);
                case self::GROUP_END:
                    if (count($insightGroupStack) == 0) {
                        throw new Error('Too many groupEnd() as opposed to group() calls!');
                    }
                    $group = array_pop($insightGroupStack);
                    return $group->close();
                default:
                    return $msg->log($Object);
            }
        }
        
        if (! $this->detectClientExtension()) {
            return false;
        }
        
        $meta = array();
        $skipFinalObjectEncode = false;
        
        if ($Object instanceof Exception) {
            
            $meta['file'] = $this->_escapeTraceFile($Object->getFile());
            $meta['line'] = $Object->getLine();
            
            $trace = $Object->getTrace();
            if ($Object instanceof ErrorException && isset($trace[0]['function']) && $trace[0]['function'] == 'errorHandler' && isset($trace[0]['class']) && $trace[0]['class'] == 'FirePHP') {
                
                $severity = false;
                switch ($Object->getSeverity()) {
                    case E_WARNING:
                        $severity = 'E_WARNING';
                        break;
                    case E_NOTICE:
                        $severity = 'E_NOTICE';
                        break;
                    case E_USER_ERROR:
                        $severity = 'E_USER_ERROR';
                        break;
                    case E_USER_WARNING:
                        $severity = 'E_USER_WARNING';
                        break;
                    case E_USER_NOTICE:
                        $severity = 'E_USER_NOTICE';
                        break;
                    case E_STRICT:
                        $severity = 'E_STRICT';
                        break;
                    case E_RECOVERABLE_ERROR:
                        $severity = 'E_RECOVERABLE_ERROR';
                        break;
                    case E_DEPRECATED:
                        $severity = 'E_DEPRECATED';
                        break;
                    case E_USER_DEPRECATED:
                        $severity = 'E_USER_DEPRECATED';
                        break;
                }
                
                $Object = array(
                    'Class' => get_class($Object),
                    'Message' => $severity . ': ' . $Object->getMessage(),
                    'File' => $this->_escapeTraceFile($Object->getFile()),
                    'Line' => $Object->getLine(),
                    'Type' => 'trigger',
                    'Trace' => $this->_escapeTrace(array_splice($trace, 2))
                );
                $skipFinalObjectEncode = true;
            } else {
                $Object = array(
                    'Class' => get_class($Object),
                    'Message' => $Object->getMessage(),
                    'File' => $this->_escapeTraceFile($Object->getFile()),
                    'Line' => $Object->getLine(),
                    'Type' => 'throw',
                    'Trace' => $this->_escapeTrace($trace)
                );
                $skipFinalObjectEncode = true;
            }
            $Type = self::EXCEPTION;
        } else 
            if ($Type == self::TRACE) {
                
                $trace = debug_backtrace();
                if (! $trace)
                    return false;
                for ($i = 0; $i < sizeof($trace); $i ++) {
                    
                    if (isset($trace[$i]['class']) && isset($trace[$i]['file']) && ($trace[$i]['class'] == 'FirePHP' || $trace[$i]['class'] == 'FB') && (substr($this->_standardizePath($trace[$i]['file']), - 18, 18) == 'FirePHPCore/fb.php' || substr($this->_standardizePath($trace[$i]['file']), - 29, 29) == 'FirePHPCore/FirePHP.class.php')) {
                        /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
                    } else 
                        if (isset($trace[$i]['class']) && isset($trace[$i + 1]['file']) && $trace[$i]['class'] == 'FirePHP' && substr($this->_standardizePath($trace[$i + 1]['file']), - 18, 18) == 'FirePHPCore/fb.php') {
                            /* Skip fb() */
                        } else 
                            if ($trace[$i]['function'] == 'fb' || $trace[$i]['function'] == 'trace' || $trace[$i]['function'] == 'send') {
                                
                                $Object = array(
                                    'Class' => isset($trace[$i]['class']) ? $trace[$i]['class'] : '',
                                    'Type' => isset($trace[$i]['type']) ? $trace[$i]['type'] : '',
                                    'Function' => isset($trace[$i]['function']) ? $trace[$i]['function'] : '',
                                    'Message' => $trace[$i]['args'][0],
                                    'File' => isset($trace[$i]['file']) ? $this->_escapeTraceFile($trace[$i]['file']) : '',
                                    'Line' => isset($trace[$i]['line']) ? $trace[$i]['line'] : '',
                                    'Args' => isset($trace[$i]['args']) ? $this->encodeObject($trace[$i]['args']) : '',
                                    'Trace' => $this->_escapeTrace(array_splice($trace, $i + 1))
                                );
                                
                                $skipFinalObjectEncode = true;
                                $meta['file'] = isset($trace[$i]['file']) ? $this->_escapeTraceFile($trace[$i]['file']) : '';
                                $meta['line'] = isset($trace[$i]['line']) ? $trace[$i]['line'] : '';
                                break;
                            }
                }
            } else 
                if ($Type == self::TABLE) {
                    
                    if (isset($Object[0]) && is_string($Object[0])) {
                        $Object[1] = $this->encodeTable($Object[1]);
                    } else {
                        $Object = $this->encodeTable($Object);
                    }
                    
                    $skipFinalObjectEncode = true;
                } else 
                    if ($Type == self::GROUP_START) {
                        
                        if (! $Label) {
                            throw $this->newException('You must specify a label for the group!');
                        }
                    } else {
                        if ($Type === null) {
                            $Type = self::LOG;
                        }
                    }
        
        if ($this->options['includeLineNumbers']) {
            if (! isset($meta['file']) || ! isset($meta['line'])) {
                
                $trace = debug_backtrace();
                for ($i = 0; $trace && $i < sizeof($trace); $i ++) {
                    
                    if (isset($trace[$i]['class']) && isset($trace[$i]['file']) && ($trace[$i]['class'] == 'FirePHP' || $trace[$i]['class'] == 'FB') && (substr($this->_standardizePath($trace[$i]['file']), - 18, 18) == 'FirePHPCore/fb.php' || substr($this->_standardizePath($trace[$i]['file']), - 29, 29) == 'FirePHPCore/FirePHP.class.php')) {
                        /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
                    } else 
                        if (isset($trace[$i]['class']) && isset($trace[$i + 1]['file']) && $trace[$i]['class'] == 'FirePHP' && substr($this->_standardizePath($trace[$i + 1]['file']), - 18, 18) == 'FirePHPCore/fb.php') {
                            /* Skip fb() */
                        } else 
                            if (isset($trace[$i]['file']) && substr($this->_standardizePath($trace[$i]['file']), - 18, 18) == 'FirePHPCore/fb.php') {
                                /* Skip FB::fb() */
                            } else {
                                $meta['file'] = isset($trace[$i]['file']) ? $this->_escapeTraceFile($trace[$i]['file']) : '';
                                $meta['line'] = isset($trace[$i]['line']) ? $trace[$i]['line'] : '';
                                break;
                            }
                }
            }
        } else {
            unset($meta['file']);
            unset($meta['line']);
        }
        
        $this->setHeader('X-Wf-Protocol-1', 'http://meta.wildfirehq.org/Protocol/JsonStream/0.2');
        $this->setHeader('X-Wf-1-Plugin-1', 'http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/' . self::VERSION);
        
        $structure_index = 1;
        if ($Type == self::DUMP) {
            $structure_index = 2;
            $this->setHeader('X-Wf-1-Structure-2', 'http://meta.firephp.org/Wildfire/Structure/FirePHP/Dump/0.1');
        } else {
            $this->setHeader('X-Wf-1-Structure-1', 'http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1');
        }
        
        if ($Type == self::DUMP) {
            $msg = '{"' . $Label . '":' . $this->jsonEncode($Object, $skipFinalObjectEncode) . '}';
        } else {
            $msg_meta = $Options;
            $msg_meta['Type'] = $Type;
            if ($Label !== null) {
                $msg_meta['Label'] = $Label;
            }
            if (isset($meta['file']) && ! isset($msg_meta['File'])) {
                $msg_meta['File'] = $meta['file'];
            }
            if (isset($meta['line']) && ! isset($msg_meta['Line'])) {
                $msg_meta['Line'] = $meta['line'];
            }
            $msg = '[' . $this->jsonEncode($msg_meta) . ',' . $this->jsonEncode($Object, $skipFinalObjectEncode) . ']';
        }
        
        $parts = explode("\n", chunk_split($msg, 5000, "\n"));
        
        for ($i = 0; $i < count($parts); $i ++) {
            
            $part = $parts[$i];
            if ($part) {
                
                if (count($parts) > 2) {
                    // Message needs to be split into multiple parts
                    $this->setHeader('X-Wf-1-' . $structure_index . '-' . '1-' . $this->messageIndex, (($i == 0) ? strlen($msg) : '') . '|' . $part . '|' . (($i < count($parts) - 2) ? '\\' : ''));
                } else {
                    $this->setHeader('X-Wf-1-' . $structure_index . '-' . '1-' . $this->messageIndex, strlen($part) . '|' . $part . '|');
                }
                
                $this->messageIndex ++;
                
                if ($this->messageIndex > 99999) {
                    throw $this->newException('Maximum number (99,999) of messages reached!');
                }
            }
        }
        
        $this->setHeader('X-Wf-1-Index', $this->messageIndex - 1);
        
        return true;
    }

    /**
     * Standardizes path for windows systems.
     *
     * @param string $Path            
     * @return string
     */
    protected function _standardizePath($Path)
    {
        return preg_replace('/\\\\+/', '/', $Path);
    }

    /**
     * Escape trace path for windows systems
     *
     * @param array $Trace            
     * @return array
     */
    protected function _escapeTrace($Trace)
    {
        if (! $Trace)
            return $Trace;
        for ($i = 0; $i < sizeof($Trace); $i ++) {
            if (isset($Trace[$i]['file'])) {
                $Trace[$i]['file'] = $this->_escapeTraceFile($Trace[$i]['file']);
            }
            if (isset($Trace[$i]['args'])) {
                $Trace[$i]['args'] = $this->encodeObject($Trace[$i]['args']);
            }
        }
        return $Trace;
    }

    /**
     * Escape file information of trace for windows systems
     *
     * @param string $File            
     * @return string
     */
    protected function _escapeTraceFile($File)
    {
        /* Check if we have a windows filepath */
        if (strpos($File, '\\')) {
            /* First strip down to single \ */
            
            $file = preg_replace('/\\\\+/', '\\', $File);
            
            return $file;
        }
        return $File;
    }

    /**
     * Check if headers have already been sent
     *
     * @param string $Filename            
     * @param integer $Linenum            
     */
    protected function headersSent(&$Filename, &$Linenum)
    {
        return headers_sent($Filename, $Linenum);
    }

    /**
     * Send header
     *
     * @param string $Name            
     * @param string $Value            
     */
    protected function setHeader($Name, $Value)
    {
        return header($Name . ': ' . $Value);
    }

    /**
     * Get user agent
     *
     * @return string|false
     */
    protected function getUserAgent()
    {
        if (! isset($_SERVER['HTTP_USER_AGENT']))
            return false;
        return $_SERVER['HTTP_USER_AGENT'];
    }

    /**
     * Get all request headers
     *
     * @return array
     */
    public static function getAllRequestHeaders()
    {
        static $_cached_headers = false;
        if ($_cached_headers !== false) {
            return $_cached_headers;
        }
        $headers = array();
        if (function_exists('getallheaders')) {
            foreach (getallheaders() as $name => $value) {
                $headers[strtolower($name)] = $value;
            }
        } else {
            foreach ($_SERVER as $name => $value) {
                if (substr($name, 0, 5) == 'HTTP_') {
                    $headers[strtolower(str_replace(' ', '-', str_replace('_', ' ', substr($name, 5))))] = $value;
                }
            }
        }
        return $_cached_headers = $headers;
    }

    /**
     * Get a request header
     *
     * @return string|false
     */
    protected function getRequestHeader($Name)
    {
        $headers = self::getAllRequestHeaders();
        if (isset($headers[strtolower($Name)])) {
            return $headers[strtolower($Name)];
        }
        return false;
    }

    /**
     * Returns a new exception
     *
     * @param string $Message            
     * @return Exception
     */
    protected function newException($Message)
    {
        return new Exception($Message);
    }

    /**
     * Encode an object into a JSON string
     *
     * Uses PHP's jeson_encode() if available
     *
     * @param object $Object
     *            The object to be encoded
     * @return string The JSON string
     */
    public function jsonEncode($Object, $skipObjectEncode = false)
    {
        if (! $skipObjectEncode) {
            $Object = $this->encodeObject($Object);
        }
        
        if (function_exists('json_encode') && $this->options['useNativeJsonEncode'] != false) {
            
            return json_encode($Object);
        } else {
            return $this->json_encode($Object);
        }
    }

    /**
     * Encodes a table by encoding each row and column with encodeObject()
     *
     * @param array $Table
     *            The table to be encoded
     * @return array
     */
    protected function encodeTable($Table)
    {
        if (! $Table)
            return $Table;
        
        $new_table = array();
        foreach ($Table as $row) {
            
            if (is_array($row)) {
                $new_row = array();
                
                foreach ($row as $item) {
                    $new_row[] = $this->encodeObject($item);
                }
                
                $new_table[] = $new_row;
            }
        }
        
        return $new_table;
    }

    /**
     * Encodes an object including members with
     * protected and private visibility
     *
     * @param Object $Object
     *            The object to be encoded
     * @param int $Depth
     *            The current traversal depth
     * @return array All members of the object
     */
    protected function encodeObject($Object, $ObjectDepth = 1, $ArrayDepth = 1, $MaxDepth = 1)
    {
        if ($MaxDepth > $this->options['maxDepth']) {
            return '** Max Depth (' . $this->options['maxDepth'] . ') **';
        }
        
        $return = array();
        
        if (is_resource($Object)) {
            
            return '** ' . (string) $Object . ' **';
        } else 
            if (is_object($Object)) {
                
                if ($ObjectDepth > $this->options['maxObjectDepth']) {
                    return '** Max Object Depth (' . $this->options['maxObjectDepth'] . ') **';
                }
                
                foreach ($this->objectStack as $refVal) {
                    if ($refVal === $Object) {
                        return '** Recursion (' . get_class($Object) . ') **';
                    }
                }
                array_push($this->objectStack, $Object);
                
                $return['__className'] = $class = get_class($Object);
                $class_lower = strtolower($class);
                
                $reflectionClass = new ReflectionClass($class);
                $properties = array();
                foreach ($reflectionClass->getProperties() as $property) {
                    $properties[$property->getName()] = $property;
                }
                
                $members = (array) $Object;
                
                foreach ($properties as $plain_name => $property) {
                    
                    $name = $raw_name = $plain_name;
                    if ($property->isStatic()) {
                        $name = 'static:' . $name;
                    }
                    if ($property->isPublic()) {
                        $name = 'public:' . $name;
                    } else 
                        if ($property->isPrivate()) {
                            $name = 'private:' . $name;
                            $raw_name = "\0" . $class . "\0" . $raw_name;
                        } else 
                            if ($property->isProtected()) {
                                $name = 'protected:' . $name;
                                $raw_name = "\0" . '*' . "\0" . $raw_name;
                            }
                    
                    if (! (isset($this->objectFilters[$class_lower]) && is_array($this->objectFilters[$class_lower]) && in_array($plain_name, $this->objectFilters[$class_lower]))) {
                        
                        if (array_key_exists($raw_name, $members) && ! $property->isStatic()) {
                            
                            $return[$name] = $this->encodeObject($members[$raw_name], $ObjectDepth + 1, 1, $MaxDepth + 1);
                        } else {
                            if (method_exists($property, 'setAccessible')) {
                                $property->setAccessible(true);
                                $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1, $MaxDepth + 1);
                            } else 
                                if ($property->isPublic()) {
                                    $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1, $MaxDepth + 1);
                                } else {
                                    $return[$name] = '** Need PHP 5.3 to get value **';
                                }
                        }
                    } else {
                        $return[$name] = '** Excluded by Filter **';
                    }
                }
                
                // Include all members that are not defined in the class
                // but exist in the object
                foreach ($members as $raw_name => $value) {
                    
                    $name = $raw_name;
                    
                    if ($name{0} == "\0") {
                        $parts = explode("\0", $name);
                        $name = $parts[2];
                    }
                    
                    $plain_name = $name;
                    
                    if (! isset($properties[$name])) {
                        $name = 'undeclared:' . $name;
                        
                        if (! (isset($this->objectFilters[$class_lower]) && is_array($this->objectFilters[$class_lower]) && in_array($plain_name, $this->objectFilters[$class_lower]))) {
                            
                            $return[$name] = $this->encodeObject($value, $ObjectDepth + 1, 1, $MaxDepth + 1);
                        } else {
                            $return[$name] = '** Excluded by Filter **';
                        }
                    }
                }
                
                array_pop($this->objectStack);
            } elseif (is_array($Object)) {
                
                if ($ArrayDepth > $this->options['maxArrayDepth']) {
                    return '** Max Array Depth (' . $this->options['maxArrayDepth'] . ') **';
                }
                
                foreach ($Object as $key => $val) {
                    
                    // Encoding the $GLOBALS PHP array causes an infinite loop
                    // if the recursion is not reset here as it contains
                    // a reference to itself. This is the only way I have come up
                    // with to stop infinite recursion in this case.
                    if ($key == 'GLOBALS' && is_array($val) && array_key_exists('GLOBALS', $val)) {
                        $val['GLOBALS'] = '** Recursion (GLOBALS) **';
                    }
                    
                    $return[$key] = $this->encodeObject($val, 1, $ArrayDepth + 1, $MaxDepth + 1);
                }
            } else {
                if (self::is_utf8($Object)) {
                    return $Object;
                } else {
                    return utf8_encode($Object);
                }
            }
        return $return;
    }

    /**
     * Returns true if $string is valid UTF-8 and false otherwise.
     *
     * @param mixed $str
     *            String to be tested
     * @return boolean
     */
    protected static function is_utf8($str)
    {
        if (function_exists('mb_detect_encoding')) {
            return (mb_detect_encoding($str) == 'UTF-8');
        }
        $c = 0;
        $b = 0;
        $bits = 0;
        $len = strlen($str);
        for ($i = 0; $i < $len; $i ++) {
            $c = ord($str[$i]);
            if ($c > 128) {
                if (($c >= 254))
                    return false;
                elseif ($c >= 252)
                    $bits = 6;
                elseif ($c >= 248)
                    $bits = 5;
                elseif ($c >= 240)
                    $bits = 4;
                elseif ($c >= 224)
                    $bits = 3;
                elseif ($c >= 192)
                    $bits = 2;
                else
                    return false;
                if (($i + $bits) > $len)
                    return false;
                while ($bits > 1) {
                    $i ++;
                    $b = ord($str[$i]);
                    if ($b < 128 || $b > 191)
                        return false;
                    $bits --;
                }
            }
        }
        return true;
    }

    /**
     * Converts to and from JSON format.
     *
     * JSON (JavaScript Object Notation) is a lightweight data-interchange
     * format. It is easy for humans to read and write. It is easy for machines
     * to parse and generate. It is based on a subset of the JavaScript
     * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
     * This feature can also be found in Python. JSON is a text format that is
     * completely language independent but uses conventions that are familiar
     * to programmers of the C-family of languages, including C, C++, C#, Java,
     * JavaScript, Perl, TCL, and many others. These properties make JSON an
     * ideal data-interchange language.
     *
     * This package provides a simple encoder and decoder for JSON notation. It
     * is intended for use with client-side Javascript applications that make
     * use of HTTPRequest to perform server communication functions - data can
     * be encoded into JSON notation for use in a client-side javascript, or
     * decoded from incoming Javascript requests. JSON format is native to
     * Javascript, and can be directly eval()'ed with no further parsing
     * overhead
     *
     * All strings should be in ASCII or UTF-8 format!
     *
     * LICENSE: Redistribution and use in source and binary forms, with or
     * without modification, are permitted provided that the following
     * conditions are met: Redistributions of source code must retain the
     * above copyright notice, this list of conditions and the following
     * disclaimer. Redistributions in binary form must reproduce the above
     * copyright notice, this list of conditions and the following disclaimer
     * in the documentation and/or other materials provided with the
     * distribution.
     *
     * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
     * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
     * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     * DAMAGE.
     *
     * @category
     *
     * @package Services_JSON
     * @author Michal Migurski <mike-json@teczno.com>
     * @author Matt Knapp <mdknapp[at]gmail[dot]com>
     * @author Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
     * @author Christoph Dorn <christoph@christophdorn.com>
     * @copyright 2005 Michal Migurski
     * @version CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
     * @license http://www.opensource.org/licenses/bsd-license.php
     * @link http://pear.php.net/pepr/pepr-proposal-show.php?id=198
     */
    
    /**
     * Keep a list of objects as we descend into the array so we can detect recursion.
     */
    private $json_objectStack = array();

    /**
     * convert a string from one UTF-8 char to one UTF-16 char
     *
     * Normally should be handled by mb_convert_encoding, but
     * provides a slower PHP-only method for installations
     * that lack the multibye string extension.
     *
     * @param string $utf8
     *            UTF-8 character
     * @return string UTF-16 character
     * @access private
     */
    private function json_utf82utf16($utf8)
    {
        // oh please oh please oh please oh please oh please
        if (function_exists('mb_convert_encoding')) {
            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
        }
        
        switch (strlen($utf8)) {
            case 1:
                // this case should never be reached, because we are in ASCII range
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return $utf8;
            
            case 2:
                // return a UTF-16 character from a 2-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0x07 & (ord($utf8{0}) >> 2)) . chr((0xC0 & (ord($utf8{0}) << 6)) | (0x3F & ord($utf8{1})));
            
            case 3:
                // return a UTF-16 character from a 3-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr((0xF0 & (ord($utf8{0}) << 4)) | (0x0F & (ord($utf8{1}) >> 2))) . chr((0xC0 & (ord($utf8{1}) << 6)) | (0x7F & ord($utf8{2})));
        }
        
        // ignoring UTF-32 for now, sorry
        return '';
    }

    /**
     * encodes an arbitrary variable into JSON format
     *
     * @param mixed $var
     *            any number, boolean, string, array, or object to be encoded.
     *            see argument 1 to Services_JSON() above for array-parsing behavior.
     *            if var is a strng, note that encode() always expects it
     *            to be in ASCII or UTF-8 format!
     *            
     * @return mixed JSON string representation of input var or an error if a problem occurs
     * @access public
     */
    private function json_encode($var)
    {
        if (is_object($var)) {
            if (in_array($var, $this->json_objectStack)) {
                return '"** Recursion **"';
            }
        }
        
        switch (gettype($var)) {
            case 'boolean':
                return $var ? 'true' : 'false';
            
            case 'NULL':
                return 'null';
            
            case 'integer':
                return (int) $var;
            
            case 'double':
            case 'float':
                return (float) $var;
            
            case 'string':
                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
                $ascii = '';
                $strlen_var = strlen($var);
                
                /*
                 * Iterate over every character in the string,
                 * escaping with a slash or encoding to UTF-8 where necessary
                 */
                for ($c = 0; $c < $strlen_var; ++ $c) {
                    
                    $ord_var_c = ord($var{$c});
                    
                    switch (true) {
                        case $ord_var_c == 0x08:
                            $ascii .= '\b';
                            break;
                        case $ord_var_c == 0x09:
                            $ascii .= '\t';
                            break;
                        case $ord_var_c == 0x0A:
                            $ascii .= '\n';
                            break;
                        case $ord_var_c == 0x0C:
                            $ascii .= '\f';
                            break;
                        case $ord_var_c == 0x0D:
                            $ascii .= '\r';
                            break;
                        
                        case $ord_var_c == 0x22:
                        case $ord_var_c == 0x2F:
                        case $ord_var_c == 0x5C:
                            // double quote, slash, slosh
                            $ascii .= '\\' . $var{$c};
                            break;
                        
                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                            // characters U-00000000 - U-0000007F (same as ASCII)
                            $ascii .= $var{$c};
                            break;
                        
                        case (($ord_var_c & 0xE0) == 0xC0):
                            // characters U-00000080 - U-000007FF, mask 110XXXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
                            $c += 1;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                        
                        case (($ord_var_c & 0xF0) == 0xE0):
                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}), ord($var{$c + 2}));
                            $c += 2;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                        
                        case (($ord_var_c & 0xF8) == 0xF0):
                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}), ord($var{$c + 2}), ord($var{$c + 3}));
                            $c += 3;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                        
                        case (($ord_var_c & 0xFC) == 0xF8):
                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}), ord($var{$c + 2}), ord($var{$c + 3}), ord($var{$c + 4}));
                            $c += 4;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                        
                        case (($ord_var_c & 0xFE) == 0xFC):
                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}), ord($var{$c + 2}), ord($var{$c + 3}), ord($var{$c + 4}), ord($var{$c + 5}));
                            $c += 5;
                            $utf16 = $this->json_utf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                    }
                }
                
                return '"' . $ascii . '"';
            
            case 'array':
                /*
                 * As per JSON spec if any array key is not an integer
                 * we must treat the the whole array as an object. We
                 * also try to catch a sparsely populated associative
                 * array with numeric keys here because some JS engines
                 * will create an array with empty indexes up to
                 * max_index which can cause memory issues and because
                 * the keys, which may be relevant, will be remapped
                 * otherwise.
                 *
                 * As per the ECMA and JSON specification an object may
                 * have any string as a property. Unfortunately due to
                 * a hole in the ECMA specification if the key is a
                 * ECMA reserved word or starts with a digit the
                 * parameter is only accessible using ECMAScript's
                 * bracket notation.
                 */

                // treat as a JSON object
                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
                    
                    $this->json_objectStack[] = $var;
                    
                    $properties = array_map(array(
                        $this,
                        'json_name_value'
                    ), array_keys($var), array_values($var));
                    
                    array_pop($this->json_objectStack);
                    
                    foreach ($properties as $property) {
                        if ($property instanceof Exception) {
                            return $property;
                        }
                    }
                    
                    return '{' . join(',', $properties) . '}';
                }
                
                $this->json_objectStack[] = $var;
                
                // treat it like a regular array
                $elements = array_map(array(
                    $this,
                    'json_encode'
                ), $var);
                
                array_pop($this->json_objectStack);
                
                foreach ($elements as $element) {
                    if ($element instanceof Exception) {
                        return $element;
                    }
                }
                
                return '[' . join(',', $elements) . ']';
            
            case 'object':
                $vars = self::encodeObject($var);
                
                $this->json_objectStack[] = $var;
                
                $properties = array_map(array(
                    $this,
                    'json_name_value'
                ), array_keys($vars), array_values($vars));
                
                array_pop($this->json_objectStack);
                
                foreach ($properties as $property) {
                    if ($property instanceof Exception) {
                        return $property;
                    }
                }
                
                return '{' . join(',', $properties) . '}';
            
            default:
                return null;
        }
    }

    /**
     * array-walking function for use in generating JSON-formatted name-value pairs
     *
     * @param string $name
     *            name of key to use
     * @param mixed $value
     *            reference to an array element to be encoded
     *            
     * @return string JSON-formatted name-value pair, like '"name":value'
     * @access private
     */
    private function json_name_value($name, $value)
    {
        // Encoding the $GLOBALS PHP array causes an infinite loop
        // if the recursion is not reset here as it contains
        // a reference to itself. This is the only way I have come up
        // with to stop infinite recursion in this case.
        if ($name == 'GLOBALS' && is_array($value) && array_key_exists('GLOBALS', $value)) {
            $value['GLOBALS'] = '** Recursion **';
        }
        
        $encoded_value = $this->json_encode($value);
        
        if ($encoded_value instanceof Exception) {
            return $encoded_value;
        }
        
        return $this->json_encode(strval($name)) . ':' . $encoded_value;
    }

    /**
     *
     * @deprecated
     *
     */
    public function setProcessorUrl($URL)
    {
        trigger_error("The FirePHP::setProcessorUrl() method is no longer supported", E_USER_DEPRECATED);
    }

    /**
     *
     * @deprecated
     *
     */
    public function setRendererUrl($URL)
    {
        trigger_error("The FirePHP::setRendererUrl() method is no longer supported", E_USER_DEPRECATED);
    }
}
